*{
    margin: 0;
    padding: 0;
}
.rightContainer{
    width: 400px;
    margin: 0 auto;
    margin-top: 20px;
}
.file {
    position: relative;
    height: 35px;
    line-height: 35px;
}
.file label {
    display: inline-block;
}
.userdefined-file {
    position: absolute;
    top: 0;
    left: 60px;
    z-index: 2;
    width: 380px;
    height: 35px;
    line-height: 35px;
    font-size: 0;  /*应对子元素为 inline-block 引起的外边距*/
}
.userdefined-file input[type="text"] {
    display: inline-block;
    vertical-align: middle;
    padding-right: 14px;
    padding-left: 14px;
    width: 300px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    height: 35px;
    line-height: 35px;
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.userdefined-file button {
    display: inline-block;
    vertical-align: middle;
    width: 80px;
    text-align: center;
    height: 35px;
    line-height: 35px;
    font-size: 14px;
    background-color: lightgray;
    border: none;
    color: #01345f;
    cursor: pointer;
}
.file input[type="file"] {
    position: absolute;
    top: 0;
    left: 60px;
    z-index: 3;
    opacity: 0;
    width: 380px;
    height: 35px;
    line-height: 35px;
    cursor: pointer;
}
.btn{
    width: 100%;
    text-align: center;
}
.btn button{
    margin-top: 15px;
    padding: 8px 40px;
    background-color: #01345f;
    color: white;
    border: none;
}